The U.S. Army warned Thursday that databases holding information on 16,000 South Korean civilian employees of the U.S. military and applicants for base jobs may have been compromised.

The military became aware on May 28 that the Korean National Recruitment System may have been breached, according to a letter addressed to Korean employees signed by Gen. Curtis M. Scaparrotti, head of U.S. Forces Korea (USFK).

Information that may have been disclosed includes peoples' names, contact information, education, work experience and Korean Identification Number, which is South Korea's national government ID issued to citizens.